(function(win) {
	var tid;

	function refreshRem() {
		let designSize = 1920; // 设计尺寸
		let html = document.documentElement;
		let wW = html.clientWidth;
		let rem = wW * 100 / designSize;
		document.documentElement.style.fontSize = rem + 'px';
	}
	win.addEventListener('resize', function() {
		clearTimeout(tid);
		tid = setTimeout(refreshRem, 1);
	}, false);
	win.addEventListener('pageshow', function(e) {
		if (e.persisted) {
			clearTimeout(tid);
			tid = setTimeout(refreshRem, 1);
		}
	}, false);
	refreshRem();
})(window)